/**
 * Smooth, deterministic lateral wander offset.
 * Sum of two incommensurate sines so the signal is continuous and bounded by
 * `amp` (weights sum to 1). Replaces uncorrelated per-frame Math.random()
 * jitter, which caused visible twitching.
 *
 * @param seed     per-fish constant (phase offset) so fish don't sync
 * @param t        animation time in seconds
 * @param freq     base frequency (Hz-ish)
 * @param amp      max absolute offset in pixels
 */
export declare function wanderOffset(seed: number, t: number, freq: number, amp: number): number;
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